"You do look really nice," chimes in- Riley, she thinks- Ethan's plus one, a beautiful and leggy blonde. "That colour looks so good on you!"
Emma glances down at her shimmery green dress. It is nice, she admits. It's beautiful in fact. But her mother gave it to her to wear specifically to this party; even though she'd wanted to go more reserved, her mother had insisted that it was important her daughter looked good tonight. And that alone makes it unworthy of praise in Emma's eyes. "Thanks."
"That colour looks like vomit," Ethan comments helpfully. Emma idly wonders why the planners have seated them at the same table.
"Be nice," Riley chides him with a tinkly laugh, hitting his shoulder. He remains unrepentant, sipping his drink and raising his eyebrows challengingly at Emma.
Emma glances around, making sure none of the adults are around before replying, "Go to hell, Ethan."
Ethan pretends to check his watch. "I've already been here for two hours."
(Or, the classic Enemies to Lovers/High School AU... with a twist or two.)